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Configuring the WAN Physical Link
Table 2-1: WAN Port Configuration Commands (continued)
Command
config ports <portlist> e1 timeslots <timeslots>
config ports <portlist> t1 yellow [detection |
generation | both | off]
Monitoring WAN Physical Links
T1, E1, and T3 devices have a built-in facility designed for troubleshooting the physical
link, called loopback. The link can also be monitored using show commands to display
the current configuration of the link, any alarms on the link, link statistics, and link
errors.
Loopback
The WAN device can be set up to loopback, that is, return a transmitted signal back to
the sender so it can be compared with the original. There are several different types of
loopback available to test different parts of the device and the line, as specified in the
T1, E1, and T3 standards.
Local WAN Port
Data in
Data out
Figure 2-1: Normal operation of WAN link
During normal operation of a link, as the local data stream enters the framer, the
appropriate framing bits are inserted into the data, and the framed signal is transmitted
2-8
Framer
Description
Sets the timeslots for data used on the E1 link.
Timeslots range from 1 to 31.
Enable and disable yellow alarm detection and
generation for T1 ports.
Remote WAN Port
Framer
Data with framing
Data out
Data in
XM_010
WAN Module Installation and User Guide
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